A property wrapper that can validate the property it wraps.
When the wrapped value changes @Validate will run the provided validations against the value.
Once validated, the isValid and errors properties can provide validation results.
The Validate framwork contains a number of built in validations such as presence, count and format. All which a various array of types.
- iOS 15.0+
- macOS 12.0+
dependencies: [
.package(url: "https://github.com/reddavis/Validate", from: "2.0.0")
]import SwiftUI
import Validate
struct ContentView: View {
@Validate(.presence()) var name: String = ""
var body: some View {
VStack(spacing: 60) {
VStack {
TextField("Name", text: self.$name.binding)
.textFieldStyle(.roundedBorder)
.padding()
VStack {
ForEach(self.$name.errors.localizedDescriptions, id: \.self) { message in
Text(message)
.foregroundColor(.red)
.font(.footnote)
}
}
}
Button("Save") {
print(self.name)
}
.buttonStyle(.bordered)
}
}
}Validate includes several validations:
You're not just limited to using the built in validations but can build your own by using the Validation builder.
This is how the built in presence validation is built:
public extension Validation {
/// Validate an optional value is present.
///
/// If the value is nil, it is considered invalid.
/// - Parameters:
/// - message: A custom error message.
/// - Returns: A Validation instance.
static func presence<T>(
message: String? = nil
) -> Validation<Optional<T>> {
.init { value in
if value == nil {
throw ValidationError.build(message: message)
}
}
}
}Check out some of my other libraries:
- Papyrus - Papyrus aims to hit the sweet spot between saving raw API responses to the file system and a fully fledged database like Realm.
- RedUx - A super simple Swift implementation of the redux pattern making use of Swift 5.5's new async await API's.
- Kyu - A persistent queue system in Swift.
- FloatingLabelTextFieldStyle - A floating label style for SwiftUI's TextField.
- Panel - A panel component similar to the iOS Airpod battery panel.